Subject:
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Re: Need Electrical Help
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Newsgroups:
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lugnet.trains
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Date:
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Thu, 16 Aug 2007 20:32:09 GMT
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Viewed:
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6436 times
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Dean Earley wrote:
> L. Andrew Reynolds wrote:
> > I am trying to setup some LED lights to run from the 9v track or a 9v
> > battery
> > pack for some train signals. I have 1.5v lights and the track is 9v
> > (obviously)
> > how can I step down the voltage. Any help would be great.
>
> Ideally, we'd need to know the current for the light you want to run.
> Even then,I can't remember the exact formula, but this page should help:
> http://www.hebeiltd.com.cn/?p=zz.led.resistor.calculator
After racking my memory and a bit of playing:
dropdown resistance = (supply voltage - required voltage) / required
current (in Amps)
--
Dean Earley, Dee (dean@earlsoft.co.uk)
irc: irc://irc.blitzed.org/
web: http://personal.earlsoft.co.uk
phone: +44 (0)780 8369596
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Message is in Reply To:
 | | Re: Need Electrical Help
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| (...) Ideally, we'd need to know the current for the light you want to run. Even then,I can't remember the exact formula, but this page should help: (URL) :) (17 years ago, 16-Aug-07, to lugnet.trains)
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